unnatural (adj.)
- aberrant
- abnormal
- affected
- amorphous
- anomalous
- apocryphal
- artificial
- assumed
- bastard
- bent
- bestial
- bizarre
- bogus
- brummagem
- callous
- calloused
- cold
- coldhearted
- colored
- contrived
- counterfeit
- crank
- cranky
- crotchety
- deviant
- different
- distorted
- divergent
- dotty
- dummy
- eccentric
- elaborate
- elaborated
- embellished
- erratic
- ersatz
- exceptional
- extraordinary
- factitious
- fake
- false
- feigned
- fey
- fictitious
- fictive
- flaky
- forced
- formless
- freakish
- funny
- garbled
- grotesque
- hard
- hardened
- hardhearted
- heartless
- histrionic
- idiosyncratic
- illegitimate
- imitation
- improper
- insensitive
- insincere
- irregular
- kinky
- kooky
- la-di-da
- labored
- maggoty
- make-believe
- man-made
- mannered
- mock
- monstrous
- nutty
- obdurate
- odd
- outlandish
- overdone
- overnice
- overrefined
- peculiar
- perverse
- perverted
- phony
- pinchbeck
- precious
- pretended
- pretentious
- preternatural
- pseudo
- quasi
- queer
- quirky
- restrained
- screwball
- screwy
- self-conscious
- self-styled
- sham
- shapeless
- shoddy
- simulated
- singular
- so-called
- soi-disant
- spurious
- stagy
- stiff
- stilted
- stonyhearted
- strange
- stray
- straying
- studied
- subnormal
- supernatural
- supposititious
- synthetic
- theatrical
- tin
- tribadistic
- twisted
- unaccountable
- unauthentic
- uncanny
- uncharacteristic
- unconventional
- unexpected
- unfeeling
- unmerciful
- unreal
- unresponsive
- unseemly
- unusual
- wacky
- wandering
- warped
- weird
- whimsical
Certainly nothing is unnatural that is not physically impossible.
